Corrosion inhibitors for a refinery

Patent metadata

Field	Value
Publication number	US-11319634-B2
Application number	US-201916715637-A
Country	US
Kind code	B2
Filing date	Dec 16, 2019
Priority date	Dec 16, 2019
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

Corrosion inhibitor compositions and methods for inhibiting corrosion on a metal surface exposed to a hydrocarbon fluid are provided. The corrosion inhibitor composition can comprise 2-aminoterephthalic acid, dimethyl sulfoxide and heavy aromatic naphtha (HAN). In another embodiment, the composition can comprise 4-methylamino benzoic acid or 4-methylsulfonyl benzoic acid, N-methyl pyrrolidone, and HAN. In the method, a corrosion inhibitor composition comprising 2-aminoterephthalic acid, 4-methylamino benzoic acid, or 4-methylsulfonyl benzoic acid can be added to a hydrocarbon fluid exposed to the metal surface. The corrosion can be caused by naphthenic acid.

First claim

What is claimed is:

1. A method for inhibiting corrosion on a metal surface exposed to a hydrocarbon fluid, the method comprising:
adding a corrosion inhibitor composition to the hydrocarbon fluid exposed to the metal surface, wherein the corrosion inhibitor composition comprises approximately: 20 weight % of 2-aminoterephthalic acid, 70 weight % of dimethyl sulfoxide, and 10 weight % of heavy aromatic naphtha, and
wherein the corrosion inhibitor composition is added to the hydrocarbon fluid in a concentration of approximately 250 ppm.

2. The method of claim 1 , wherein corrosion inhibitor composition is added to the hydrocarbon fluid in a refinery process, wherein the refinery process is performed at a temperature of approximately 200° C. to approximately 400° C., and wherein the corrosion inhibitor composition inhibits naphthenic acid corrosion on the metal surface.

3. The method of claim 1 , wherein the method inhibits corrosion caused by naphthenic acid.

4. The method of claim 1 , wherein the corrosion inhibitor composition is free of phosphate.

5. A method for inhibiting corrosion on a metal surface exposed to a hydrocarbon fluid, the method comprising:
adding a corrosion inhibitor composition to the hydrocarbon fluid exposed to the metal surface, wherein the corrosion inhibitor composition comprises approximately: 20 weight % of 4-methylamino benzoic acid, 70 weight % of N-methyl pyrrolidone, and 10 weight % of heavy aromatic naphtha (HAN), and
wherein the corrosion inhibitor composition is added to the hydrocarbon fluid in a concentration of approximately 500 ppm.

6. The method of claim 5 , wherein the method inhibits corrosion caused by naphthenic acid.

7. The method of claim 5 , wherein the corrosion inhibitor composition is free of phosphate.

8. The method of claim 5 , wherein corrosion inhibitor composition is added to the hydrocarbon fluid in a refinery process, wherein the refinery process is performed at a temperature of approximately 200° C. to approximately 400° C., and wherein the corrosion inhibitor composition inhibits naphthenic acid corrosion on the metal surface.

9. A method for inhibiting corrosion on a metal surface exposed to a hydrocarbon fluid, the method comprising:
adding a corrosion inhibitor composition to the hydrocarbon fluid exposed to the metal surface, wherein the corrosion inhibitor composition comprises approximately: 20 weight % of 4-methylsulfonyl benzoic acid, 70 weight % of N-methyl pyrrolidone, and 10 weight % of heavy aromatic naphtha (HAN), and
wherein the corrosion inhibitor composition is added to the hydrocarbon fluid in a concentration of approximately 1000 ppm.

10. The method of claim 9 , wherein the method inhibits corrosion caused by naphthenic acid.

11. The method of claim 9 , wherein the corrosion inhibitor composition is free of phosphate.

12. The method of claim 9 , wherein corrosion inhibitor composition is added to the hydrocarbon fluid in a refinery process, wherein the refinery process is performed at a temperature of approximately 200° C. to approximately 400° C., and wherein the corrosion inhibitor composition inhibits naphthenic acid corrosion on the metal surface.

Assignees

• Saudi Arabian Oil Co

Inventors

• Nagu Muthukumar
• Alanazi Nayef M

Classifications

• C23F11/149

  Heterocyclic compounds containing nitrogen as hetero atom · CPC title

• C23F11/144 Primary

  Aminocarboxylic acids · CPC title

• C10G21/20

  Nitrogen-containing compounds · CPC title

• C10G21/22

  Compounds containing sulfur, selenium, or tellurium · CPC title

• C10G2300/203

  Naphthenic acids, TAN · CPC title